23328521 has 2 divisors, whose sum is σ = 23328522. Its totient is φ = 23328520.

The previous prime is 23328517. The next prime is 23328553. The reversal of 23328521 is 12582332.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21492496 + 1836025 = 4636^2 + 1355^2 .

It is a cyclic number.

It is not a de Polignac number, because 23328521 - 2² = 23328517 is a prime.

It is not a weakly prime, because it can be changed into another prime (23328581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11664260 + 11664261.

It is an arithmetic number, because the mean of its divisors is an integer number (11664261).

Almost surely, 2^23328521 is an apocalyptic number.

It is an amenable number.

23328521 is a deficient number, since it is larger than the sum of its proper divisors (1).

23328521 is an equidigital number, since it uses as much as digits as its factorization.

23328521 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2880, while the sum is 26.

The square root of 23328521 is about 4829.9607658862. The cubic root of 23328521 is about 285.7343164885.

The spelling of 23328521 in words is "twenty-three million, three hundred twenty-eight thousand, five hundred twenty-one".